Reorganize test dir to ensure test of installed pkg

tests/test_swacc_swmod/regblock.rdl

@@ -0,0 +1,25 @@
+addrmap top {
+    default regwidth = 8;
+
+    reg {
+        field {
+            sw=r; hw=w;
+            swacc;
+        } f[8];
+    } r1;
+
+    reg {
+        field {
+            sw=rw; hw=r;
+            swmod;
+        } f[8] = 20;
+    } r2;
+
+    reg {
+        field {
+            sw=rw; hw=r;
+            swmod;
+            rclr;
+        } f[8] = 30;
+    } r3;
+};